package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * ClassName: LoginCheckFilter
 * Package: com.itheima.filter
 * Description:
 * @Author: @Albert
 * @Version: 1.0
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 获取本次请求得uri
        String requestURI = request.getRequestURI();
        log.info("拦截到请求:" + request.getRequestURI());
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"//移动端登录
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        // 如果不需要处理，则放行
        if(check){
            log.info("请求:{}不需要处理", request.getRequestURI());
            filterChain.doFilter(request, response);
            return;
        }

        // 判断登录状态，如果已经登录则放行
        if(request.getSession().getAttribute("employee")!=null){
            Long empId=(Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            log.info("用户已经登录,用户ID为{}",empId);
            filterChain.doFilter(request, response);
            return;
        }
        // 判断移动端登录状态，如果已经登录则放行
        if(request.getSession().getAttribute("user")!=null){
            Long empId=(Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        //未登录则返回未登录结束
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls,String requestURL){
        for(String url:urls){
            boolean match = PATH_MATCHER.match(url, requestURL);
            if(match){
                return true;
            }
        }
        return false;
    }
}
